Rob, The hair algae can indicate a slowly dying light bulb or can simply be the result of feeding live/frozen foods. I see it in my tanks off and on. There are two organisms I know of that will eat it: 1) true siamese algae eaters (even if you get the real thing, it is not guaranteed... some of them decide that they prefer the fish food you feed the other fish to the hair algae) and 2) rainbow and ghost shrimp (the rainbow shrimp are better). When I want to clear up some hair algae, I run down to the local fish store and pick up a bunch (10 to 20 per affected tank) of rainbow shrimp. I have also found recently that treating the tank regularly with copper (eg Aquari-Sol) prevents hair algae. It does not harm my swordplants and the hair algae does not seem to survive the treatment process. I use a full dose every other day during outbreaks and once a week otherwise (with no carbon in the filter). That's all I can give you from my experience with hair algae. --Cliff ------------------------------------------------------------------------- This is the apistogramma mailing list, apisto@majordomo.pobox.com. For instructions on how to subscribe or unsubscribe or get help, email apisto-request@majordomo.pobox.com. Search http://altavista.digital.com for "Apistogramma Mailing List Archives"!